PS(1) BSD Reference Manual PS(1)
ps - process status
ps [-aCehjlmrSTuvwx] [-M core] [-N system] [-O fmt] [-o fmt] [-p pid] [-t
tty] [-W swap]
Ps displays a header line followed by lines containing information about
your processes that have controlling terminals. This information is
sorted by process ID.
The information displayed is selected based on a set of keywords (see the
-L -O and -o options). The default output format includes, for each pro-
cess, the process' ID, controlling terminal, cpu time (including both us-
er and system time), state, and associated command.
The options are as follows:
-a Display information about other users' processes as well as your
-C Change the way the cpu percentage is calculated by using a
``raw'' cpu calculation that ignores ``resident'' time (this nor-
mally has no effect).
-e Display the environment as well.
-h Repeat the information header as often as necessary to guarantee
one header per page of information.
-j Print information associated with the following keywords: user,
pid, ppid, pgid, sess, jobc, state, tt, time and command.
-L List the set of available keywords.
-l Display information associated with the following keywords: uid,
pid, ppid, cpu, pri, nice, vsz, rss, wchan, state, tt, time and
-M Extract values associated with the name list from the specified
core instead of the default ``/dev/kmem''.
-m Sort by memory usage, instead of by process ID.
-N Extract the name list from the specified system instead of the
-O Add the information associated with the space or comma separated
list of keywords specified, after the process ID, in the default
information display. Keywords may be appended with an equals
(``='') sign and a string. This causes the printed header to use
the specified string instead of the standard header.
-o Display information associated with the space or comma separated
list of keywords specified. Keywords may be appended with an
equals (``='') sign and a string. This causes the printed header
to use the specified string instead of the standard header.
-p Display information associated with the specified process ID.
-r Sort by current cpu usage, instead of by process ID.
-S Change the way the process time is calculated by summing all ex-
ited children to their parent process.
-T Display information about processes attached to the device asso-
ciated with the standard input.
-t Display information about processes attached to the specified
-u Display information associated with the following keywords: user,
pid, %cpu, %mem, vsz, rss, tt, state, start, time and command.
The -u option implies the -r option.
-v Display information associated with the following keywords: pid,
state, time, sl, re, pagein, vsz, rss, lim, tsiz, %cpu, %mem and
command. The -v option implies the -m option.
-W Extract swap information from the specified file instead of the
-w Use 132 columns to display information, instead of the default
which is your window size. If the -w option is specified more
than once, ps will use as many columns as necessary without re-
gard for your window size.
-x Display information about processes without controlling termi-
A complete list of the available keywords are listed below. Some of
these keywords are further specified as follows:
%cpu The cpu utilization of the process; this is a decaying average
over up to a minute of previous (real) time. Since the time base
over which this is computed varies (since processes may be very
young) it is possible for the sum of all %CPU fields to exceed
%mem The percentage of real memory used by this process.
flags The flags (in hexadecimal) associated with the process as in the
include file <sys/proc.h>:
SLOAD 0x0000001 in core
SSYS 0x0000002 swapper or pager process
SLOCK 0x0000004 process being swapped out
SSWAP 0x0000008 save area flag
STRC 0x0000010 process is being traced
SWTED 0x0000020 another tracing flag
SSINTR 0x0000040 sleep is interruptible
SKEEP 0x0000100 another flag to prevent swap out
SOMASK 0x0000200 restore old mask after taking signal
SWEXIT 0x0000400 working on exiting
SPHYSIO 0x0000800 doing physical I/O
SVFORK 0x0001000 process resulted from vfork(2)
SVFDONE 0x0002000 another vfork flag
SNOVM 0x0004000 no vm, parent in a vfork
SPAGV 0x0008000 init data space on demand, from vnode
SSEQL 0x0010000 user warned of sequential vm behavior
SUANOM 0x0020000 user warned of random vm behavior
STIMO 0x0040000 timing out during sleep
SNOCLDSTOP 0x0080000 no SIGCHLD when children stop
SCTTY 0x0100000 has a controlling terminal
SOWEUPC 0x0200000 owe process an addupc() call at next
SSEL 0x0400000 selecting; wakeup/waiting danger
SEXEC 0x0800000 process called exec(2)
SHPUX 0x1000000 HP-UX process (HPUXCOMPAT)
SULOCK 0x2000000 locked in core after swap error
SPTECHG 0x4000000 pte's for process have changed
lim The soft limit on memory used, specified via a call to
lstart The exact time the command started, using the ``%C'' format de-
scribed in strftime(3).
nice The process scheduling increment (see setpriority(2)).
rss the real memory (resident set) size of the process (in 1024 byte
start The time the command started. If the command started less than
24 hours ago, the start time is displayed using the ``%l:ps.1p''
format described in strftime(3). If the command started less
than 7 days ago, the start time is displayed using the
``%a6.15p'' format. Otherwise, the start time is displayed using
the ``%e%b%y'' format.
state The state is given by a sequence of letters, for example,
``RWNA''. The first letter indicates the run state of the pro-
D Marks a process in disk (or other short term, uninter-
I Marks a process that is idle (sleeping for longer than
about 20 seconds).
R Marks a runnable process.
S Marks a process that is sleeping for less than about 20
T Marks a stopped process.
Z Marks a dead process (a ``zombie'').
Additional characters after these, if any, indicate additional
+ The process is in the foreground process group of its
< The process has raised CPU scheduling priority.
> The process has specified a soft limit on memory require-
ments and is currently exceeding that limit; such a pro-
cess is (necessarily) not swapped.
A the process has asked for random page replacement
(VA_ANOM, from vadvise(2), for example, lisp(1) in a
E The process is trying to exit.
L The process has pages locked in core (for example, for
N The process has reduced CPU scheduling priority (see
S The process has asked for FIFO page replacement (VA_SEQL,
from vadvise(2), for example, a large image processing
program using virtual memory to sequentially address vo-
s The process is a session leader.
V The process is suspended during a vfork.
W The process is swapped out.
X The process is being traced or debugged.
tt An abbreviation for the pathname of the controlling terminal, if
any. The abbreviation consists of the two letters following
``/dev/tty'', or, for the console, ``co''. This is followed by a
``-'' if the process can no longer reach that controlling termi-
nal (i.e., it has been revoked).
wchan The event (an address in the system) on which a process waits.
When printed numerically, the initial part of the address is
trimmed off and the result is printed in hex, for example,
0x80324000 prints as 324000.
When printing using the command keyword, a process that has exited and
has a parent that has not yet waited for the process (in other words, a
zombie) is listed as ``<defunct>'', and a process which is blocked while
trying to exit is listed as ``<exiting>''. Ps makes an educated guess as
to the file name and arguments given when the process was created by ex-
amining memory or the swap area. The method is inherently somewhat unre-
liable and in any event a process is entitled to destroy this informa-
tion, so the names cannot be depended on too much. The ucomm (account-
ing) keyword can, however, be depended on.
The following is a complete list of the available keywords and their
meanings. Several of them have aliases (keywords which are synonyms).
%cpu percentage cpu usage (alias pcpu)
%mem percentage memory usage (alias pmem)
acflag accounting flag (alias acflg)
command command and arguments
cpu short-term cpu usage factor (for scheduling)
flags the process flags, in hexadecimal (alias f)
inblk total blocks read (alias inblock)
jobc job control count
ktrace tracing flags
ktracep tracing vnode
lim memoryuse limit
logname login name of user who started the process
lstart time started
majflt total page faults
minflt total page reclaims
msgrcv total messages received (reads from pipes/sockets)
msgsnd total messages sent (writes on pipes/sockets)
nice nice value (alias ni)
nivcsw total involuntary context switches
nsigs total signals taken (alias nsignals)
nswap total swaps in/out
nvcsw total voluntary context switches
nwchan wait channel (as an address)
oublk total blocks written (alias oublock)
p_ru resource usage (valid only for zombie)
paddr swap address
pagein pageins (same as majflt)
pgid process group number
pid process ID
poip pageouts in progress
ppid parent process ID
pri scheduling priority
re core residency time (in seconds; 127 = infinity)
rgid real group ID
rlink reverse link on run queue, or 0
rss resident set size
rsz resident set size + (text size / text use count) (alias rs-
ruid real user ID
ruser user name (from ruid)
sess session pointer
sig pending signals (alias pending)
sigcatch caught signals (alias caught)
sigignore ignored signals (alias ignored)
sigmask blocked signals (alias blocked)
sl sleep time (in seconds; 127 = infinity)
start time started
state symbolic process state (alias stat)
svgid saved gid from a setgid executable
svuid saved uid from a setuid executable
tdev control terminal device number
time accumulated cpu time, user + system (alias cputime)
tpgid control terminal process group ID
tsess control terminal session pointer
tsiz text size (in Kbytes)
tt control terminal name (two letter abbreviation)
tty full name of control terminal
uprocp process pointer
ucomm name to be used for accounting
uid effective user ID
upr scheduling priority on return from system call (alias usrpri)
user user name (from uid)
vsz virtual size in Kbytes (alias vsize)
wchan wait channel (as a symbolic name)
xstat exit or stop status (valid only for stopped or zombie process)
/dev special files and device names
/dev/drum default swap device
/dev/kmem default kernel memory
/var/run/dev.db /dev name database
/var/run/kvm_vmunix.db system namelist database
/vmunix default system namelist
kill(1), w(1), kvm(3), strftime(3), pstat(8)
Since ps cannot run faster than the system and is run as any other sched-
uled process, the information it displays can never be exact.
4th Berkeley Distribution April 18, 1994 5